EP0232568A1 - Système de commande d'un membre pour suivre un objet mobile, dispositif de traite automatique et procédé pour la traite automatique - Google Patents

Système de commande d'un membre pour suivre un objet mobile, dispositif de traite automatique et procédé pour la traite automatique Download PDF

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Publication number
EP0232568A1
EP0232568A1 EP86202380A EP86202380A EP0232568A1 EP 0232568 A1 EP0232568 A1 EP 0232568A1 EP 86202380 A EP86202380 A EP 86202380A EP 86202380 A EP86202380 A EP 86202380A EP 0232568 A1 EP0232568 A1 EP 0232568A1
Authority
EP
European Patent Office
Prior art keywords
teat
animal
control system
automatic milking
transmitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86202380A
Other languages
German (de)
English (en)
Other versions
EP0232568B1 (fr
Inventor
Maximus Andreas Hilhorst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Prolion BV
Original Assignee
Prolion BV
Multinorm BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Prolion BV, Multinorm BV filed Critical Prolion BV
Priority to AT86202380T priority Critical patent/ATE64475T1/de
Publication of EP0232568A1 publication Critical patent/EP0232568A1/fr
Application granted granted Critical
Publication of EP0232568B1 publication Critical patent/EP0232568B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/87—Combinations of sonar systems
    • G01S15/876—Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01J—MANUFACTURE OF DAIRY PRODUCTS
    • A01J5/00—Milking machines or devices
    • A01J5/017—Automatic attaching or detaching of clusters
    • A01J5/0175—Attaching of clusters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J19/00—Accessories fitted to manipulators, e.g. for monitoring, for viewing; Safety devices combined with or specially adapted for use in connection with manipulators
    • B25J19/02—Sensing devices
    • B25J19/026—Acoustical sensing devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications

Definitions

  • This invention relates to a system for the control of a member for following a moving object according to the preamble of claim 1.
  • a control system of the kind is known from EP-A-0 106 719. From this, a position sensing system for the determination of a position in a nuclear reactor is known.
  • a disadvantage of this known control system is that it is not possible to follow a relatively small object accurately in a large space, said small object being part of a larger entity which can have a disturbing effect during sensing, as is the case, for example, with the teat of a cow.
  • This invention has for its aim to provide a control system wherein it is possible to follow the movements of a small moving object accurately.
  • control system has the feature of claim 1.
  • the ultrasonic sensor units are inexpensive and relatively insensitive to the dirt prevalent in an industrial or an agricultural environment. Since the sensor units are coupled securely to the means of movement, the system of coordinates defined by the sensor units in which the moving object is situated moves as well as the object and, as far as possible, in correspondence to those movements. Since the sensor units can be brought relatively close to the object to be followed, the influence of the distracting larger entity is reduced, and an accurate control system is obtained using simple reflection-sensing of the object. Through this, a fine control system, to be coupled to a coarse control system, can be formed.
  • control system according claim 2 is used.
  • the follower device can approach the object in directions other than those along which parts of the frame are arranged, for example along a surface of the larger entity whereof the object is part.
  • the control system is capable of following movements at a moving object frequency of up to 100 Hz with an accuracy of 1 mm, in the central area of an operational zone of roughly 100 x 100 mm, at a distance of 50 mm from each sensor unit.
  • control system can moreover be applied in a milking apparatus for milking a cow, as described for example in the present applicants' Dutch patent application 85.02434.
  • movements of a cow's teat occur, in practice, at a frequency of up to a maximum of 50 Hz.
  • the invention provides a method for the automatic milking of a cow, wherein an automatic milking apparatus is applied.
  • each sensor unit 3, 4 consists of an ultrasonic transmitter, 9 and 10 respectively, and an ultrasonic receiver, 11 and 12 respectively, each transmitters and receiver being mounted in a wave guide 5, 6, 7 and 8 respectively, said transmitters 9, 10 and receivers 11, 12, being mounted for reasons of shielding at some distance from openings 13 for the ultrasonic waves and said wave guides 5, 6, 7 and 8 having bevelled ends 14, 15, 16 and 17 respectively for further improvement of that shielding.
  • Sensor units 3 and 4 are secured at right angles to frame 21, which is fixed to follower member 1 and thus similarly fixed to the movement means.
  • the position sensing system is further provided with a conversion means 20 coupled to transmitters 9, 10 and to receivers 11, 12, said conversion means comprising counting means for the measurement of the interval of time which elapses between the emission of a wave by a transmitter and the reception of the reflected wave by the associated receiver, and a means for determining the position of the object reflecting the vibration from that interval.
  • Conversion means 20 may comprise a microprocessor coupled to a memory containing a program. Conversion means 20 are further joined by connections 22 and 23 to means (not shown) for moving the follower member. Movement means of the kind consist, for instance, of an arm coupled to a robot, and are generally known (see for example Dutch patent application 85.02434).
  • Conversion means 20 send a pulse to transmitter 9 by means of a transmitter circuit to be described later and then measure, with aid of the counting means, the time interval which has elapses between the emission of a vibration by the transmitter and the reception of the reflected vibration, which is conveyed to the counting means via an envelope detector to be described herebelow. By this means it is determined on which of lines 24 - 29 the moving object is situated.
  • a pulse is conveyed by the conversion means via a similar transmitter circuit to transmitter 10, which transmits ultrasonic waves to the moving object, in a similar way, via arrows 32 and 133, whereafter receiver 12, the envelope detector and the counting means determine, in a similar way, on which of the broken lines 33, 34, 35, 36, 37 or 38 the moving object is situated.
  • conversion means 20 on which intersection of a continuous line and a broken line the moving object is situated, and if this detected position differs from a previously defined value stored in the conversion means, for example point O of a coordinate system XY depicted in figure 2, conversion means 20 immediately regulate the movement means in order to so change the position of the follower member and thus of sensor units 3, 4 that the moving object is once again situated at point O of the mobile coordinate system XY.
  • follower member 1 can grasp the moving object.
  • the follower member consists, for example, of two fingers 39, 40 which can be operated by conversion means 20 through agency of an electric motor 41.
  • fingers 39, 40 move in the direction of arrows B until they grip the moving object (see the position of the fingers drawn in broken lines).
  • each transmitter and each receiver comprises a relatively simple per se known transducer 42, shown in figure 3, which comprises a housing 43, fastened thereto a (for example) aluminium cone 44, a piezo-ceramic element 45 to convert ultrasonic waves conveyed by the cone into electrical signals, a damping plate 46 and leads 47 and 48 joined severally to piezo-ceramic element 45.
  • a relatively simple per se known transducer 42 shown in figure 3 which comprises a housing 43, fastened thereto a (for example) aluminium cone 44, a piezo-ceramic element 45 to convert ultrasonic waves conveyed by the cone into electrical signals, a damping plate 46 and leads 47 and 48 joined severally to piezo-ceramic element 45.
  • transducer 42 makes use of a pulse originating from the conversion means which is applied across terminals 50, 51 of transmitter circuit 49.
  • a transistor 52 is made conductive with the aid of resistor 53, whereby transistor 55 is made conductive with the aid of resistor 54, so that the full supply voltage, for example 24 V, is applied via three resistors 56, 57 and 58 across terminals 47 and 48.
  • the transmitter circuit is further provided with earthed decoupling capacitors 59 and 60 next to resistors 56 and 58 respectively.
  • the spectrum of the ultrasonic wave pattern issued by transducer 42 is determined both by the electrical properties and the mechanical properties of the transducer.
  • a waveform arises which comprises predominantly, but not exclusively, waves at the transducer's electrical resonant frequency of approximately 40 kHz, while moreover an amplitude results which increases and decreases only slowly, in comparison to the steep rising and falling edges of the pulse, on account of the mechanical properties of the transducer, so that a kind of envelope of the 40 kHz waves is formed.
  • an envelope detector 61 is shown, to be coupled to the conversion means at E, which detector can be switched by the conversion means with the aid of a schematically depicted electronic switch 62 between the transducers 42 of receivers 11 and 12 respectively.
  • the above­described emitted, reflected and thereby attenuated wave pattern is passed via A (figure 5A) over a resistor 63 to an amplifier 64.
  • the detected signal is fed, via high quality factor (Q-factor) band-pass filters 65 and 66 which only allow passage of waves at the electrical resonant of approximately 40 kHz, at point B to peak detector 67.
  • Q-factor quality factor
  • the DC voltage level at B can be accurately adjusted with the aid of adjustment circuit 68.
  • the moment at which the signal has reached its maximum value is determined with the aid of a peak detector 71, and there results the signal shown in figure 5D, which is converted by an A/D unit 72 into a digital form suitable for the conversion means.
  • envelope detector 61 it is possible to measure the elapsed time interval between emission and reception with a narrower accuracy than the oscillatory period of the 40 kHz waves. (Compare the above-described accuracy to the wave-length of 40 kHz waves in air of about 8 mm.)
  • the envelope detection makes use of the above-described mechanical properties of the transducer.
  • the control system according to the invention can be applied with advantage in an automatic milking apparatus (figure 6) for a cow, in which the object to be followed is a cow's teat and in which the follower device is milking rack 74, provided with four teat cups 73, which is arranged for the four teats of a cow. Above one of the teat cups 73, there are mounted sensor units 3, 4, which are connected in a way not shown to the movement means of an arm 75 of a milking apparatus, not shown.
  • Sensor units 3, 4 need only be mounted around one of the teat cups 73, since after automatic recognition of a cow by the automatic milking apparatus the other three teat cups 73 have already been arranged in a mutual pattern characteristic for the specific cow (see NL-A-­85.02434).
  • the follow device may equally comprise only one teat cup.
  • a third embodiment of the control system according to the invention is mounted on a milking rack 80 that is provided with four teat cups 81, on which there are arranged conduits 82 and 83, for the carrying off of milk and for the application of a vacuum in the teat cups, respectively.
  • Teat cups 81 are held on the milking rack by means of a biaxial hinge 84, so that they can pivot with respect to milking rack 80 within limits determined by limiting bars 85. Teat cups 81 can be moved upwards, as will be further described herebelow, to a position around teats 86 of an udder 87.
  • Milking rack 80 is gripped by movement means in the form of an arm 88 of a robot 89.
  • arm 88 is connected detachably to the milking rack, so that robot 89, which is movable on account of guide rails 90 and 91 and transmission 92, can also be deployed for other milking racks.
  • the cow comes to stand on a grid 93, beneath which a trough 94 for the discharge of dung is arranged.
  • piezo-electric films 98 each of which functions as ultrasonic transmitter as well as ultrasonic receiver, are curved, there results a focussing of the ultrasonic waves and hence a precise delimitation of the sensing region, particularly in the vertical direction, so that a flat sensing zone is obtained, such that in figure 7 a practically constant distance of teat cups 81 with respect to teats 86 results.
  • the sensing zone occupies an area of, for instance, 10 x 8 x 2 cm.
  • a teat cup 81 (figure 9) is coupled to an only partly shown milking rack through a biaxial hinge 84.
  • Upper portion 100 of the teat cup is slidable inside lower portion 102 thereof, so that upper part 100 can be raised by action of a piston slidable in a cylinder 102.
  • pistons 103, 104 there are arranged pistons which push the entire housing 105 in which cylinders 103, 104 are mounted down against milking rack 80 so that the hinging operation of hinge 84 is blocked.
  • the slidable pistons in cylinders 102, 103, 104 are driven hydraulically or pneumatically in a manner not further shown.
  • a sensor ring 107 which is provided with at least three sensor elements 108 arranged symmetrically around the opening, which elements preferentially consist of ultrasonic transmitter-receiver combinations.
  • the sensor elements can, however, consists of light-detecting and light-emitting elements, as described in Dutch patent application 85.02434, mounted on ring 107.
  • Sensor elements 108 jointly form a fine sensor, which is connected to the controlling means for arm 88 of robot 89, so that, during the raising of the upper portion 100, as soon as sensor elements 108 detect the teat within ring 107, this fine sensor takes over the control of robot arm 88 and ensures that ring 107 holds teat 86 of a cow exactly in its centre.
  • sensor unit 95 - 98 adopts a position with respect to the right fore test of a cow such that a teat cup 81 is located directly under teat 86, for example the left rear teat thereof.
  • the relative positions of the teats of a particular cow are stored in the memory of the control system of robot 89, and adjusted in the light of new data at each milking.
  • the size of the udder and hence the relative teat positions change with time, for example depending on the time since the previous milking.
  • sensor unit 95 - 98 can take, through agency of the controller of robot 89, the correct position each time with respect to the right fore teat of the cow.
  • housing 105 When teat 86 is situated directly above teat cup 81, housing 105 becomes locked onto milking rack 80 by means of the pistons sliding in cylinders 103, 104, so that hinge 84 is immobilized. Then, through the agency of a piston 109 (figure 10B) which slides in a cylinder 102, said cylinder 102 and thereby the upper portion 100 of teat cup 81 is raised by hydraulic or pneumatic pressure to a position around teat 86. Hereby, the control of milking rack 80 is taken over by the fine sensor mounted in ring 107, immediately after sensor elements 108 have ascertained the presence of teat 86.
  • teat cup 81 As soon as upper portion 100 of teat cup 81 is arranged entirely around the teat, milking can take place by agency of conduits 82 and 83 (figure 10C), and after housing 105 has been raised with respect to the milking rack teat cup 81 can follow the motions of teat 86, as indicated by broken lines in figure 10C.
  • teat cup has been brought around teat 86, and a next teat cup 81 can be positioned under a teat 86 (figure 11C), while the first fitted teat cup can move in the direction of arrow C, since said first fitted teat cup is hingeably joined to milking rack 80.
  • the teat cups can be fitted one by one, the mutual positions of the teats being after all known from the memory of the control system, and sensor unit 95 - 98 can therefore always adopt the correct position with respect to right fore teat 86.
  • the sensing space can also be formed by three mutually perpendicular sensor units, it being once again possible to bring the follower member towards the object along directions not blocked by a frame.
  • each sensor unit is disposed at a different angle than any other sensor unit or units.
EP86202380A 1985-12-27 1986-12-24 Système de commande d'un membre pour suivre un objet mobile, dispositif de traite automatique et procédé pour la traite automatique Expired - Lifetime EP0232568B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86202380T ATE64475T1 (de) 1985-12-27 1986-12-24 System zur steuerung eines elements zur nachfuehrung eines bewegten objektes, eine automatische melkanlage und ein verfahren zum automatischen melken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8503580 1985-12-27
NL8503580A NL8503580A (nl) 1985-12-27 1985-12-27 Systeem voor het besturen van een orgaan voor het volgen van een bewegend object.

Publications (2)

Publication Number Publication Date
EP0232568A1 true EP0232568A1 (fr) 1987-08-19
EP0232568B1 EP0232568B1 (fr) 1991-06-12

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Family Applications (1)

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EP86202380A Expired - Lifetime EP0232568B1 (fr) 1985-12-27 1986-12-24 Système de commande d'un membre pour suivre un objet mobile, dispositif de traite automatique et procédé pour la traite automatique

Country Status (9)

Country Link
US (1) US4872147A (fr)
EP (1) EP0232568B1 (fr)
JP (1) JP2572381B2 (fr)
AT (1) ATE64475T1 (fr)
CA (1) CA1271720A (fr)
DE (1) DE3679808D1 (fr)
DK (1) DK628886A (fr)
NL (1) NL8503580A (fr)
NZ (1) NZ218790A (fr)

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US8590488B2 (en) 2010-08-31 2013-11-26 Technologies Holdings Corp. Vision system for facilitating the automated application of disinfectant to the teats of dairy livestock
US8671885B2 (en) 2011-04-28 2014-03-18 Technologies Holdings Corp. Vision system for robotic attacher
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US8800487B2 (en) 2010-08-31 2014-08-12 Technologies Holdings Corp. System and method for controlling the position of a robot carriage based on the position of a milking stall of an adjacent rotary milking platform
US8885891B2 (en) 2011-04-28 2014-11-11 Technologies Holdings Corp. System and method for analyzing data captured by a three-dimensional camera
US8903129B2 (en) 2011-04-28 2014-12-02 Technologies Holdings Corp. System and method for filtering data captured by a 2D camera
US9043988B2 (en) 2011-04-28 2015-06-02 Technologies Holdings Corp. Milking box with storage area for teat cups
US9049843B2 (en) 2011-04-28 2015-06-09 Technologies Holdings Corp. Milking box with a robotic attacher having a three-dimensional range of motion
US9058657B2 (en) 2011-04-28 2015-06-16 Technologies Holdings Corp. System and method for filtering data captured by a 3D camera
US9107379B2 (en) 2011-04-28 2015-08-18 Technologies Holdings Corp. Arrangement of milking box stalls
US9149018B2 (en) 2010-08-31 2015-10-06 Technologies Holdings Corp. System and method for determining whether to operate a robot in conjunction with a rotary milking platform based on detection of a milking claw
US9161511B2 (en) 2010-07-06 2015-10-20 Technologies Holdings Corp. Automated rotary milking system
US9161512B2 (en) 2011-04-28 2015-10-20 Technologies Holdings Corp. Milking box with robotic attacher comprising an arm that pivots, rotates, and grips
US9215861B2 (en) 2011-04-28 2015-12-22 Technologies Holdings Corp. Milking box with robotic attacher and backplane for tracking movements of a dairy animal
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ATE64475T1 (de) 1991-06-15
NL8503580A (nl) 1987-07-16
DK628886D0 (da) 1986-12-23
CA1271720A (fr) 1990-07-17
EP0232568B1 (fr) 1991-06-12
DE3679808D1 (de) 1991-07-18
JPS62159078A (ja) 1987-07-15
US4872147A (en) 1989-10-03
NZ218790A (en) 1989-11-28
DK628886A (da) 1987-06-28
JP2572381B2 (ja) 1997-01-16

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